You’re right that abuse is very old and is probably just now becoming something that people reflect on en masse, which would imply it’s not the major cause of this shift. As for my evidence that baby boomers are narcissistic, well, I only have popular culture, my own gut feelings, and various possibly biased history youtubers as sources; I have never thought to look for studies on the matter. I would place at least 70% credence on there being at least one well-regarded study finding that boomers on average have a higher proportion of narcissistic traits than earlier generations, however.
You’re right that abuse is very old and is probably just now becoming something that people reflect on en masse, which would imply it’s not the major cause of this shift. As for my evidence that baby boomers are narcissistic, well, I only have popular culture, my own gut feelings, and various possibly biased history youtubers as sources; I have never thought to look for studies on the matter. I would place at least 70% credence on there being at least one well-regarded study finding that boomers on average have a higher proportion of narcissistic traits than earlier generations, however.